The rapid growth of urbanization has been acknowledged by many researchers and has turned into a challenge for most countries, especially developing countries like Afghanistan. Although the theme of urbanization is new in Afghanistan, this sector has lately attracted the attention of national and international entities in Afghanistan. This is considered to be one of the biggest obstacles that hinder achieving a sustainable future development, and also prevents the implementation of the city’s future master plan. At the same time, it is an obvious fact that social conflicts disturb the social life and physical form of cities, and its examples are seen throughout the world. Thus, many social, physical, and economic problems are found, of which the creation of informal settlements is the prime example. The informality of urban fabric is a common subject in all developing countries. It is argued broadly throughout academic and research articles that informal settlements are created by the poor or established due to inappropriate planning systems and policies. With a fast pace, informal urban areas have now become home to a large number of people in developing countries throughout the world. In the case of Kabul, the capital city of Afghanistan, informal settlements represent up to 80% of the total city population. The study focuses on finding the factors behind the growth of informal settlements in Kabul. The purpose is to provide the notion and understanding of the way these settlements are created and their existing conditions. The paper does not suggest a model of change for informal settlements.